摘要：The flow field of a new type of submersible mixer with two layers impellers and six blades in wastewater treatment pool is studied in this paper. Large-scale software, such as Pro/engineering, FLUENT 15.0 and ICEM, were used. After that, the wastewater treatment pool was numerically simulated by RNG k-ε turbulent model and move coordinate system technology. The macro fluid field and flow field distribution of sections were analyzed. Compared with the traditional mixer, water thrust and torque of the new type of submersible mixer are increased to 1.9 times and 1.4 times respectively, and the effective axial thrust distance is increased to1.2 times. The fluid in the pool is stirred fully. The high-velocity fluid zone is formed along the axial direction of the mixer, and 4 water cycles are formed at the up and down in the pool. The velocity of the fluid upper the middle of the pool and near the bottom of the pool is low, but the average velocity is larger than 0.1m/s. The fluid in the pool is propelled axially and diffused radially. Coanda effect can be watched obviously. The velocity distribution curve of the fluid near the outlet of the impeller is saddle-like, with two velocity peaks. But the velocity distribution curve of the fluid far away from the impeller outlet is parabolic-like, with only one velocity peak. The performance of the new submersible mixer is greatly enhanced and it can stir more water. This is suitable to the working requirements of the submersible mixer. And this simulate method can guide practical wastewater treatment engineering of mixers.
